extra page to show custom stuff from config

[alexanderniebuhr]

should we build an extra page or modal, to show colors and shortcuts defined in config

reference https://ptb.discord.com/channels/810981250981953597/813781309184671765/830824830466129980

[antfu]

I kinda think we can have something like "defined but not in use", similar to #13. So ppl could find some mis-usages as well (like it should be used but not) or removing redundant configs.